Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory
Abstract
We present a theoretical parametrization of the nucleon electromagnetic form factors (FFs) based on a combination of chiral effective field theory and dispersion analysis. The isovector spectral functions on the two-pion cut are computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike pion FF data. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). Excellent agreement with the spacelike proton and neutron FF data is achieved up to $$Q^2 \sim$$ 1 $GeV^2$. Here, our parametrization provides proper analyticity and theoretical uncertainty estimates and can be used for low-$Q^2$ FF studies and proton radius extraction.
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1464272
- Alternate Identifier(s):
- OSTI ID: 1469112
- Report Number(s):
- JLAB-THY-18-2675; DOE/OR/-23177-4402; arXiv:1803.09748
Journal ID: ISSN 0370-2693; S0370269318306154; PII: S0370269318306154
- Grant/Contract Number:
- AC05-06OR23177; FPA2016-77313-P; FPA2016-75654-C2-2-P
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters B
- Additional Journal Information:
- Journal Name: Physics Letters B Journal Volume: 784 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Nucleon form factors; Proton radius puzzle; Dispersion relations; Chiral effective field theory
Citation Formats
Alarcón, J. M., and Weiss, C. Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory. Netherlands: N. p., 2018.
Web. https://doi.org/10.1016/j.physletb.2018.07.060.
Alarcón, J. M., & Weiss, C. Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory. Netherlands. https://doi.org/10.1016/j.physletb.2018.07.060
Alarcón, J. M., and Weiss, C. Sat .
"Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory". Netherlands. https://doi.org/10.1016/j.physletb.2018.07.060.
@article{osti_1464272,
title = {Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory},
author = {Alarcón, J. M. and Weiss, C.},
abstractNote = {We present a theoretical parametrization of the nucleon electromagnetic form factors (FFs) based on a combination of chiral effective field theory and dispersion analysis. The isovector spectral functions on the two-pion cut are computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike pion FF data. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). Excellent agreement with the spacelike proton and neutron FF data is achieved up to $Q^2 \sim$ 1 $GeV^2$. Here, our parametrization provides proper analyticity and theoretical uncertainty estimates and can be used for low-$Q^2$ FF studies and proton radius extraction.},
doi = {10.1016/j.physletb.2018.07.060},
journal = {Physics Letters B},
number = C,
volume = 784,
place = {Netherlands},
year = {2018},
month = {9}
}
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https://doi.org/10.1016/j.physletb.2018.07.060
https://doi.org/10.1016/j.physletb.2018.07.060
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Cited by: 4 works
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Works referencing / citing this record:
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- Junker, Olov; Leupold, Stefan; Perotti, Elisabetta
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- Alarcón, J. M.; Higinbotham, D. W.; Weiss, C.
- Physical Review C, Vol. 99, Issue 4
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- Zhou, Shuang; Giulani, P.; Piekarewicz, J.
- Physical Review C, Vol. 99, Issue 5
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- Shintani, Eigo; Ishikawa, Ken-Ichi; Kuramashi, Yoshinobu
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- Detmold, William; Edwards, Robert G.; Dudek, Jozef J.
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